Security key
01749D105
ALLEGRO MICROSYSTEMS, INC. - Common Stock (ALGM)
CUSIP: 01749D105
Q1 2026 13F Holders as of 31 Mar 2026
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 138,333,947
- Total 13F value
- $4,322,844,798
- Share change
- +1,860,816
- Put/Call ratio
- 83%
- SEC-reported price per share
- $31.53
- Number of holders
- 318
- Value change
- +$80,391,490
- Number of buys
- 186
- Number of sells
- 121
- Shares outstanding
- 185,710,725
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2026
Institutions
318
Top holders
10
ALGM full security history
Ownership snapshot
Full 13F holder table
ALLEGRO MICROSYSTEMS, INC. SEC filings
ALLEGRO MICROSYSTEMS, INC. company facts
Broader feeds
Ownership snapshot
Top reported holders of ALGM - ALLEGRO MICROSYSTEMS, INC. - Common Stock (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
FMR LLC
Disclosed value leader
FMR LLC
Comparable rows
15/15
Latest evidence
31 Mar 2026
13D/G
13F
3/4/5
Lead comparable stake: 15%
13D/G row: FMR LLC
Showing 1-6 of 15 holder rows.
Quick read
FMR LLC leads the comparable SEC ownership view at 15%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens FMR LLC's linked filing trail.
Comparable ownership
Top 5
FMR LLC
15%
Capital Research Global Investors
7.1%
Yoshihiro Suzuki
0.11%
Joseph R. Martin
0.02%
Richard R. Lury
0.01%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| FMR LLC |
13D/G
13F
Company
|
15%
|
$1,043,102,661
27,421,206 shares
|
+$143,998,860 | 31 Mar 2026 |
| Capital Research Global Investors |
13D/G
13F
Company
|
7.1%
|
$410,252,327
13,111,292 shares
|
-$87,395,004 | 31 Dec 2025 |
| Yoshihiro Suzuki |
3/4/5
Director
|
0.11%
|
$7,850,465
213,560 shares
|
— | 07 Aug 2025 |
| Joseph R. Martin |
3/4/5
Director
|
0.02%
|
$1,293,180
35,179 shares
|
— | 07 Aug 2025 |
| Richard R. Lury |
3/4/5
Director
|
0.01%
|
$599,848
18,857 shares
|
-$222,673 | 12 Aug 2025 |
| Mary G. Puma |
3/4/5
Director
|
0.01%
|
$642,675
17,483 shares
|
— | 07 Aug 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
318
Shares
138,333,947
Rows available
318
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2026 vs Q1 2026 Across Filers
Q1 2026 holders
318
Q1 2026 holders
318
Holder diff
0
| Investor | Q1 2026 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q1 2026 value | Value change | Value Chg % |
|---|